The structure of casein in heated suspensions affects the acid gelification of milk

The structure of casein in heated suspensions affects the acid gelification of milk. FIL-IDF "Fermented milk

Ab-Initio Determination of La2Mo4O15 Crystal Structure from X-rays and Neutron Powder Diffraction

International audienceThe structure of La(2)Mo(4)O(15) has been determined from both high resolution X-ray and neutron powder diffraction data. This molybdate crystallizes in a monoclinic space group P2(1)/n with cell parameters a = 9.0357(2) Angstrom, b = 12.7737(2) Angstrom, c = 10.6408(2) Angstrom, beta = 90.2491(6)degrees. The structure consists of molybdenum octahedra [MoO6] and tetrahedra [MoO4], and lanthanum polyhedra [LaO9], Molybdenum polyhedra are connected: together, forming large units [Mo6O22], isolated by lanthanum polyhedral chains, This structure is compared with those of already known lanthanide molybdates with formula Ln(2)Mo(4)O(15) (Ln = Ce, Ho)

Effects of Partial Substitution of Mo6+ by Cr6+ and W6+ on the Crystal Structure of the Fast Oxide-Ion Conductor La2Mo2O9

International audienceThe crystal structure of the solid solutions La2Mo2-yCryO9 (y≤0.5) and La2Mo2-yWyO9 (y≤1.4) has been studied using X-ray and neutron powder diffraction. These two series of lanthanum molybdates, which belong to the LAMOX family of fast oxide-ion conductors, exhibit a different structural behavior depending on the substituting element. The Cr series follows a regular Vegard-type evolution of crystallographic parameters. However, the behavior of theWseries is different, the lattice constant varying in a nonlinear fashion with substitution level, resulting in a smaller cell volume for higher tungsten contents, despite the larger ionic radius of tungsten. Two main structural effects are evidenced: a variation in the distribution of ligands around tungsten, made apparent through the changing balance of oxygen O2 and O3 site occupancies along the series, and a nonlinear evolution of interatomic distances and angles involving the O1 oxygen site. An alternative structural description, based on [O1La3Mo] antitetrahedra, is proposed in order to better account for the transport properties of these materials

The structure of casein in heated suspensions affects the acid gelification of milk

The structure of casein in heated suspensions affects the acid gelification of milk. FIL-IDF "Fermented milk

Physico-chemical changes during acidification by a yoghurt starter of heat-treated milk

Physico-chemical changes during acidification by a yoghurt starter of heat-treated milk. 26 ème congrès international de laiteri

The structure of casein in heated suspensions affects the acid gelification of milk

The structure of casein in heated suspensions affects the acid gelification of milk. FIL-IDF "Fermented milk

Structure of Na2Ca(HPO4)2 determined ab initio from conventional powder diffraction data

ABSTRACT. — The structure of Na 2Ca(HPO 4) 2 is monoclinic (space group P2 1, Z = 2) with cell parameters a = 9.0652(3) Å, b = 7.1468(2) Å, c = 5.4700(2) Å and β = 98.782(1)°. The initial structural model was obtained from direct methods applied to 650 integrated intensities. The Rietveld refinement converged to final Bragg and profiles indicators R B = 4.1 % and R P = 8.6 %. The tridimensional structure is built up from interconnected [CaO 7] pentagonal bipyramids, [NaO 5] distorted trigonal bipyramids and [HPO 4] tetrahedra sharing corners or edges. Sodium atoms occupy tunnels extending along the c axis with non-regular octogonal aperture